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公开(公告)号：US1407764A
公开(公告)日：1922-02-28
申请号：US34360019
申请日：1919-12-09
Applicant: GUSTAF OSBERG
Inventor： GUSTAF OSBERG
IPC: B23B29/14
CPC classification number: B23B29/14 , Y10T407/137
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